2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 232Get this manual

2009-2011 Honda FourTrax Rancher AT TRX420FA/FPA Service Manual, Page 232

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CYLINDER HEADNALVE Measure each follower bore I.DSERVICE LIMIT: 22.54 mm (0.887 in)
Cover the piston with shop towel or equivalent to protect it from damage
Rotate the crankshaft to align